Adjustable elbow



May 16, 1933. o. P. NYTRoM 1,99,309

ADJUSTABLE ELBOW Filed Feb. 16, 1931 Oscar P Nrx'om W Patented May 1.6, 1193?;

NITE 'STATES' OSCAR P. Nvs'rtoiir,4 or HOLLAND, trilcHreAN,` AssIGNoia 'rov HOLLAND FUNNACE coMrANY,'or i-roLLANn,V ivrIoHreAN, A coRPoRATroN or MICHIGAN ADJUSTABLE ELBOW Application filed February 16,1931. Serial No. 516,142.

This invention relates generally to sheet metal construction and more VYparticularlyy to an adjustable elbow.

Previous to my invention considerable difficulty has been encountered in the installation of sheet metal pipes or conduits for carrying air and the like as the size and bulkiness of the relatively large sheet metal pipes,

as well as their rather weak construction,- precludes exact and strictly alined installations, and hence it is usually necessary to bend and flex the adjacent pipes and conduits so that the usual overlapping engagement may be had therebetween. The usual installation of the above character occurs without accurate floor and elevation plans and oftentimes without any plans at all. In

both of these cases it is advantageous to have adjustable fittings whereby installation may L be accordingly simplified.

One of the principal aims of my invention is to inventively create an elbow which may be readily adjusted to the desired angle during its installation, thus eliminating fitting and trying f the same, with a consequent decrease in labor and cost. In other words, there is no need to attempt to estimate the desired elbow for a particular joint but one 'can simply fasten one arm of my novel elbow unit in place and then bend the other arm so as to obtain an exact and perfect fit;

Another advantage of my construction lies in its cheap construction, such, obviously, being necessary in this day and age. My

""t' device consists of only two main parts and ing the two arms of the elbow in different angular position with respect to each other. Fig. 3 is a view in cross section taken along the line 3 3 of Fig. 1.

Fig. l is a view taken along the line 5 5 of Fig. 1.

Fig. 5 is a viewvshowing the several parts i of the elbow in'ldisasseinbled relationship. In the drawing, 10 designates the side plates, 11 thetop plate, and 12 the bottom plate of the straight arm of` my novel elbow.

This Straight'arm is of rectangular crossv section, as clearly' 'shown in the drawing,and will hereinafter v,be Areferred Vto as the fixed arm vin order to distinguish it from the mov-r ableconduitor arm which is adjustably attached thereto. The bottom plate 12 has av series o-fgholesfl adj acentone edge thereof through which'rivets 14 pass. n 4

The movable part or arm of the elbow has side portions or plates/15, eachterminating in an arced forwardr edge, see Fig. 5, a top plate16, and a lowerplate 17, said lower plate having a Vflap or portion 1'8l integral therewith. The flap 18 has holes. 19 formed therein and the rivets 14; pass through these holesand are riveted over thus connecting the two arms together. f i Qne position lof the arms is indicated in F ig. 2 and metal screws21 are driven through f theside plates 10 and 15 to maintain the movable 'arm in fixed position relative to the other arm. A screwk is also inserted between the plates 11 and 16 as shown. .Y

The sideplates 15 support the brackets 22 which areheldthereto by the rivets 23. The inturned portion of each bracket rides under and supports the free end portion ofthe top plate 16 as the movable arm Visrotated to a considerable angle with respect to the fixed arm. See Fig. 1. flap 18 and the bottom plate 17 serves as a hingeas shown in the drawing. Afterl the arms are positioned relative to each 'as' de# sired, metal fasteningV screws `21 are-located' between the top platesll and 16 whereby the .Y

two parts of the elbow in position. y

are vpermanently held -Tte opration .l I

is readilyunderstood. The fixed arm is located vin its permanent positionfand then the movable arm is bent to its chosen position'. i The flap or flange 18 bends during.. this manipulation. A lso, the free end portion of the top `plate .member 16 cams or! rides yThe juncture between the against the inner side of the top plate 11 and the abutting of the brackets against the inner face of the top plate member 16 prevents it from bowing inwardly. After the several parts are in the position desired, holes are punched through the contacting plates in the desired positions and screws are driven there` through thus securing` the arms securely. Asbestos paper or insulating-coating is now applied tothe outside of the elbowin the usual manner and thus an efficient installation is obtained. A l

Having thus described myV invention I desire it to be understood that the invention is in no wise limited to the particular illustrative embodiment disclosed, the scope thereof being set forth in the following claims.

I claim: i

1. An article of manufacture of the character described vcomprising a hollow member having a rectangular shaped cross section, another hollow member having a bottom plate, side'plates anda top plate, said bottom plate having a depending bendab'le flap riveted to the first mentioned yhollow member whereby the members are connected together, said top plate having a free portion adapted to frictionally engage interio-rly of the first mentioned hollow member.

2. An article of'manufacture of the character described comprising two members of similar and hollow cross section whereby one may fit inside of the. other, a flap depending from one ofisaid members, and means for fastening the said flap rigidly to the other member whereby the members may be positioned relatively to each other by'bending of the flap during such manipulation, the member having the iap also having side walls and a top wall, the side walls being curved in a circumference abo-ut the flap whereby they freely and snugly enter the member ynot having the flap thereon.

3. An elbow of the class described 'comprising a hollow arm, another hollow arm attached thereto, said arms being movable relative to each other by a relatively large strain whereby distortion of one of the arms is had, one arm also having a portion thereof frictionally engaging interiorly of the first mentioned arm whereby the two arms are held in their adjusted position, said distortion also tending to maintain the arms in their adjusted position.

4. An elbow of the class described consisting of two telescoping` members adapted to be turned at an angle to each other and hinge means therebetween, said hinge means comprising a sheet metal flap integral with vone of the members and fastened rigidly to the other of the members. Y

5. An. article of manufacture of the character described comprising a. hollow member having airectangular shaped cross section, another hollow member having a bottom plate, `side plates and a top plate, said bottom plate having a depending means connected onto the first mentioned hollow member whereby the members are movably connected together, sai-d top plate having a free portion adapted jto engage interiorly of the first mentioned hollow member, andy bracket means rigidly connected to the inner side plates of thek second mentioned hollow` member to prevent excessive Vinward movement ofthe said free portion of the said top plate.

I n testimony whereof I affix my signature.

OSCAR I). NYSTROM. 

